I’m not a big fan of double rooms, but maybe that’s because I went to a boarding school, and was in the military for three years, and dislike the idea of sharing a room with anybody but a spouse intensely. However, I do like the situation described by @rickle1. The crappy dorms are for freshmen as a kind of rite of passage, after which things get better.
Of course, at that age, I was sleeping in tents with 20 other guys, and double rooms with indoor showers would have been an unbelievable luxury, so I’m sure that freshmen will do just fine there…
it also solves the problem of different level dorms - rather than some kids get great dorms, and others get crappy dorms, everybody get crappy dorms during the first year, and everybody gets good dorms thereafter. So all kids really go through the same dorm experience, regardless of family income or even luck.